Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Martin J Theobald, O.D.
Optometrist in Duluth, MN · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1609842210
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Registry record
Entity type Individual (Type 1)
Name Martin J Theobald
Credential O.D.
Sex Male
Practice address 3308 W Arrowhead Rd, Duluth, MN, 55811
Phone (218) 727-6400
Enumeration date Feb 23, 2006
Last updated in NPPES Jul 8, 2007
Taxonomy & licenses
OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses.
About the OD credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| A62871023475 | Other | MN | PREFERRED ONE |
| 110960 | Other | MN | UCARE |
| 2207594 | Other | MN | MEDICA |
| 6C248TH | Other | MN | FIRST PLAN MINNESOTA |
| 897821023475 | Other | MN | PREFERRED ONE |
| 6C248TH | Other | MN | ATRIUM & BCBS |
| 2203074 | Other | MN | MEDICA |
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.
Frequently asked questions
What is the NPI number for Martin Theobald?
The National Provider Identifier (NPI) for Martin Theobald is 1609842210, a Type 1 (individual) record in the CMS NPPES registry.
Where does Martin Theobald practice?
The practice location on file with NPPES is in Duluth, MN. Providers can have multiple locations; NPPES lists the primary practice address.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.